Another sample where the drag and drop happens between TableViews owned by different view controllers in a vertical split viewTableView-DragDrop across view controllers
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Yes this is possible.
I will try to create a sample as soon as possible.
You can have one co-ordinating controller which is has a strong reference to View Controller 1 and 2 and the drag and drop functionality will be mostly be controlled through the co-ordinating controller.

thanks again for your perfect support. it is near to be perfect. one little thing:
i would like to realize, that you can drop items from source to target tableview, without removing it from target – this woks perfect ! but if you drag an item from source to source or from target to target, it will be duplicate. is it possible to move this element to the dragged position instead to copy it = realize reordering of the tableview rows.